[Intel-gfx] [PATCH 48/66] drm/i915: Move the SPLL enabling into hsw_crt_pre_enable

[Daniel Vetter]

The call to intel_ddi_pll_enable in haswell_crtc_mode_set is the only
function that still touches the hardware state from the crtc mode_set
callback on hsw. Since the SPLL isn't ever shared we can easily take
it out into the hsw crt encoder functions.

Temporarily we'll loose a bit of WARN_ON coverage with this, but once
the WRPLLs are switched over that will be restored. For the SPLL
selection add a WARN in the hsw fdi link training code.

Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/intel_crt.c |  8 ++++++++
 drivers/gpu/drm/i915/intel_ddi.c | 18 ------------------
 2 files changed, 8 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index d3cae57d942a..ec806e432545 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -187,6 +187,7 @@ static void hsw_fdi_link_train(struct drm_crtc *crtc)
 
 	/* Configure Port Clock Select */
 	I915_WRITE(PORT_CLK_SEL(PORT_E), intel_crtc->ddi_pll_sel);
+	WARN_ON(intel_crtc->ddi_pll_sel != PORT_CLK_SEL_SPLL);
 
 	/* Start the training iterating through available voltages and emphasis,
 	 * testing each value twice. */
@@ -276,6 +277,13 @@ static void hsw_fdi_link_train(struct drm_crtc *crtc)
 static void hsw_crt_pre_enable(struct intel_encoder *encoder)
 {
 	struct drm_device *dev = encoder->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	WARN(I915_READ(SPLL_CTL) & SPLL_PLL_ENABLE, "SPLL already enabled\n");
+	I915_WRITE(SPLL_CTL,
+		   SPLL_PLL_ENABLE | SPLL_PLL_FREQ_1350MHz | SPLL_PLL_SSC);
+	POSTING_READ(SPLL_CTL);
+	udelay(20);
 
 	intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A, true);
 
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 13abde3e848f..4fde38a253f0 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -718,23 +718,6 @@ void intel_ddi_pll_enable(struct intel_crtc *crtc)
 	BUILD_BUG_ON(enable_bit != WRPLL_PLL_ENABLE);
 
 	switch (crtc->ddi_pll_sel) {
-	case PORT_CLK_SEL_LCPLL_2700:
-	case PORT_CLK_SEL_LCPLL_1350:
-	case PORT_CLK_SEL_LCPLL_810:
-		/*
-		 * LCPLL should always be enabled at this point of the mode set
-		 * sequence, so nothing to do.
-		 */
-		return;
-
-	case PORT_CLK_SEL_SPLL:
-		new_val = SPLL_PLL_ENABLE | SPLL_PLL_FREQ_1350MHz |
-			  SPLL_PLL_SSC;
-		WARN(I915_READ(SPLL_CTL) & enable_bit, "SPLL already enabled\n");
-		I915_WRITE(SPLL_CTL, new_val);
-		POSTING_READ(SPLL_CTL);
-		udelay(20);
-		return;
 	case PORT_CLK_SEL_WRPLL1:
 	case PORT_CLK_SEL_WRPLL2:
 		if (crtc->ddi_pll_sel == PORT_CLK_SEL_WRPLL1) {
@@ -759,7 +742,6 @@ void intel_ddi_pll_enable(struct intel_crtc *crtc)
 		WARN(1, "Bad selected pll: PORT_CLK_SEL_NONE\n");
 		return;
 	default:
-		WARN(1, "Bad selected pll: 0x%08x\n", crtc->ddi_pll_sel);
 		return;
 	}
 
-- 
1.8.1.4